Wireless Moves has two very strong posts about the benefits and challenges of Skype and SIP on mobile handsets, such as the Nokia N and E series devices which have been used for SIP based VoIP for a few years now.
Worth a read if you give a SIP about the next stages of where things may go and the speedbumps we can expect to see.
You may also want to check out the viewpoints of the Telco 2.0 team regarding Skype and how as more people start using Skype there's a lesser need for PSTN internetworking.
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